At 3 months of treatment: Change from baseline of the FEV1 and PEFR (also %predicted); Number of patients without asthma symptoms

At 3 months of treatment: FEV1 before and after salbutamol inhalation; Difference in PEF pm-am (in %); The daily (daytime and night-time) symptoms scores; % of symptom free days during the treatment period; Use of other antiasthmatic medication